Special Relativity, Waves & Geometrical Optics-Geometrical Optics [IAS (Admin.) Mains Physics]: Questions 1 - 4 of 13

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Question 1

Appeared in Year: 2010 (IFS)

Describe in Detail Subjective▾

Consider a system of two thin lenses of focal lengths and separated by a distance of in air. For an object of height placed at a distance of in front of the convex lens, find the size and position of the image. (Section A)

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Explanation

  • Image from first lens is given as,

… (159 more equations) …

Question 2

Appeared in Year: 2007

Describe in Detail Subjective▾

What are chromatic and spherical aberrations. Explain. Calculate the longitudinal aberration for rays at a height of from the principle axis and incident on the cowed surface (radius of curvature = ) of a thin piano – convex lens made of glass (refractive index = 1.5)

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Explanation

  • Aberrations are divided broadly into two categories – monochromatic aberrations and chromatic aberrations. The defects due to wide – angle incidence and peripheral incidence, which occur even with monochromatic light, are called monochromatic aberrations. Aberration that occur due to dispersion of light are called chromatic aberration. Chromatic ab…

… (489 more words) …

Question 3

Appeared in Year: 2005

Describe in Detail Subjective▾

What do you understand by paraxial rays? Show that the effect of translation of a paraxial ray while travelling along a homogenous medium is represented by a matrix if the ray is initially defined by a matrix.

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Explanation

A ray is said to be paraxial if the angle between the ray and the principle axis (or symmetry axis) is small. Only rays inclined at less than about t the principle axis are considered as paraxial rays and they lie close to the axis throughout the distance from object to image. As the angles are small and wh…

… (316 more equations, 5 figures) …

Question 4

Appeared in Year: 2018

Describe in Detail Subjective▾

What do you mean by spherical aberration of a lens? Show that if two Plano – convex lenses are kept at a distance equal to the difference of their focal lengths, the spherical aberration would be minimum. (Paper-I)

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Explanation

A lens may be regarded as made up of a large number of prisms, of increasing angles from the centre to outward is case of a convex lens and of decreasing angles in case of a concave lens. A ray of light falling on a prism of larger angle is deviated more towards the base of the prism than that falling on a prism of small angle. Therefore, periphera…

… (113 more equations, 4 figures) …